Yuan Dong personally went out and ordered the servants to cut down five pine trees, then had them bound into a raft with rope and rowed it over to the hole. Then, over a dozen servants took great pains to carry the completed raft into the tunnel.

Chiyun Yuexuan started to instruct them on the work needing done. First they used two trunks as support to prop up the raft, then attached the ropes to the tip of the trunks before steadily lowering the raft to the opposite cliff so it could ...